Here is the full list of all 45 Ben 10 Ultimate Alien: Cosmic Destruction achievements worth 1,000 gamerscore.
Defeated all of Vulkanus’ minions
Defeated 100 enemies
Got a 10 hit combo
Got a 100 hit combo
Found all of the hidden Sumo Slammers in the game
Found all of the hidden Sumo Slammers in the Catacombs
Unlocked Rath as a playable character
Completed the Game
Completed the Final Battle level
Found all of the hidden Sumo Slammers in the Final Battle
Saved all of the civilians in the Final Battle
Destroyed 500 breakable objects
Fully upgraded all aliens
Completed the Colosseum level
Found all of the hidden Sumo Slammers in the Colosseum
Destroyed all cars within the game
Defeated 50 enemies as Ben Tennyson
Watched the entire credits
Fully upgraded one alien
Completed the Amazon level
Found all of the hidden Sumo Slammers in the Amazon
Completed the Ultimate Echo event
Destroyed all the security cameras in the Amazon level
Completed the Tokyo Nights level
Found all of the hidden Sumo Slammers in Tokyo Nights
Completed the Zombozo Ultimate event
Earned One Million DNA
Completed the Great Wall level
Found all of the hidden Sumo Slammers in the Great Wall
Defeated the Terracotta General
Destroyed 200 breakable objects
Found all of the hidden Sumo Slammers in Devils Tower
Got a 50 hit combo
Defeated 500 enemies
Completed the Devil's Tower level
Completed the Sunder Ultimate event
Completed the Eiffel Tower level
Found all of the hidden Sumo Slammers in the Eiffel Tower
Defeated 200 enemies
Spent 10000 on upgrades
Spent 1000 on upgrades
Completed the Catacombs level
Discovered all of the Combat Bonuses
Destroyed 30 breakable objects
Got a 25 hit combo